PassMark USB Short Circuit Tester USB SOS

do you ever wonder where your phone or tablet seems to charge faster from some USB power sources but slower or not at all on others this is because USB ports are not all created equal in fact this is very far from the case the world of USB is complex with several generations of USB USB 1 2 & 3 the USB battery charging and power delivery specifications and many different types of connectors such as type B micro B and now a new connector called USB see in the beginning USB ports were mainly used for data transfer and were only meant to deliver enough power for small peripherals now we expect the humble USB port to power all sorts of devices from fans to LED lights and to charge batteries in phones and laptops starting with USB one released in 1996 we could get up to 100 milliamps at 5 volts over 4 wires then in April 2000 USB 2.0 was released with devices being classified as either low po